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The construction of light-trees is one of the principal sub-problems for all-optical multicast technology in wavelength division multiplexing (WDM) networks. In this paper a new algorithm proposed to maximize quality of service by minimizing dispersion on the converted wavelength. Network cost is significantly reduced by decreasing number of wavelengths and Number of wavelength converters utilized...
The low data rate ad hoc wireless sensor network over IEEE 802.15.4 protocol has been implemented as an alternative to overcome network bottleneck problem. Unlike IEEE 802.11 protocol that allows RTS/CTS method, the former protocol does not include mechanism to avoid hidden nodes problem. This paper elaborates an evaluation study of hidden nodes effect on the proposed network. Comparison study is...
The accuracy for any spectrum sensing technique in cognitive radio (CR) is affected by the transmission channel parameters such as the signal to noise ratio (SNR). In this paper, a special approach is used to estimate the SNR in the received primary user (PU) signal. This approach is based on using filter bank transform which is called hybrid slantlet transform (HST). This transform decomposes the...
In recent years, Wireless Mesh Networks (WMNs) considered as a practical solution for last-mile broadband wireless internet access. In this mode of wireless ad hoc networks, nodes may play the role of APs or Mesh Routers (MRs) to offer a short way to packets to find their destinations. However, as each node in WMNs has to transmit extra relayed traffic as well as its own; the capacity of such networks...
As Cognitive Radio (CR) technology is recently emerged as a potential solution to overcome the problem of spectrum scarcity, Cognitive Wireless Mesh Networks (CogMesh) have great potential for enhancing the performance of wireless networks and meeting the demands of future generation wireless applications. By utilizing the available frequency bands that are unutilized by primary (licensed) users,...
In wireless ad hoc networks, all nodes have equal right to access the medium. Hence, the performance of this mode is mostly limited by traffic congestion. To alleviate such a problem, Cognitive Radio (CR) technology can be used. Recent researches show that a large amount of licensed spectrum remains unused at a specific time. The contribution of this paper is to investigate a CR-based Medium Access...
The performance of wireless ad hoc networks is mostly be limited by the traffic congestion. To alleviate such a problem, Cognitive Radio (CR) technology can be used. The contribution of this paper is to investigate a CR-based Medium Access Control (MAC) layer for wireless ad hoc networks. We aim to focus on a Cognitive MAC protocols for a no licensed user which can be enabled to access the large amount...
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